PSLV-QL C48 - RISAT-2BR1 & 9 cubesats - FLP - 11 December 2019 (09:55 UTC)

[zubenelgenubi]

RISAT-2BR1

Launch scheduling; cross-post:

https://www.thehindu.com/sci-tech/science/isro-launches-to-resume-in-october-sivan/article29363065.ece
ISRO would take up Cartosat-3, a high-resolution earth observation satellite, in October. Within a week of it it would launch RISAT-2BR1.

https://www.business-standard.com/article/current-affairs/orbiter-s-life-to-be-7-years-as-it-now-has-extra-fuel-isro-chief-k-sivan-119090900010_1.html

Future programmes will go as planned. Starting with the Cartosat-3 launch by the end of October, followed by RISAT-2BR1 within a week of the Cartosat launch. <snip>

To achieve this launch cadence, would launch be from the FLP?  (Assuming Cartosat-3 is launched from the SLP.)

And, deducing from the payload mass of 615 kg, launching to an 37 deg. inclined low Earth orbit, the launcher version should be Core Alone?  RISAT-2B launched on a PSLV-CA.

[ZachS09]

If RISAT 2BR1 is launching by itself, then it would make sense for the Core-Alone variant to be used.

I mean, why would ISRO attach PSOMs on the rocket if it’s a light payload?

[zubenelgenubi]

Cross-post:
https://spaceflight.com/spaceflight-announces-next-three-rideshare-missions-on-isros-pslv-slated-through-the-end-of-2019/

Presser:

Spaceflight Announces Next Three Rideshare Missions on ISRO’s PSLV, Slated Through the End of 2019

The rideshare service provider will launch 14 customer satellites from four different organizations on the next three launches

SEATTLE – Oct. 15, 2019 – Spaceflight, the leading satellite rideshare and mission management provider, today announced it will launch 14 more spacecraft from India’s Polar Satellite Launch Vehicle (PSLV) this year. Payloads will launch on PSLV’s C47, C48 and C49 missions, scheduled to launch in November and December 2019 from India’s Satish Dhawan Space Center. Customers aboard the missions include Analytical Space, Spire, iQPS and Kleos Space.
<snip>
PSLV C48, slated for early December, will carry Japan’s iQPS SAR microsatellite and four multi-payload Earth observation nanosatellites that add to Spire Global's constellation of maritime, aviation and weather monitoring satellites.

[zubenelgenubi]

As of today's successful launch of Cartosat-3 et al., this should be the next launch.

A tantalizing statement...

ISRO Chairman giving final congratulations. Coming back "very soon."

[K210]

Given the delay with this launch they might launch RISAT-2BR1 and RISAT-2BR2 together on a single pslv. Assuming similar launch mass to RISAT-2B (615kg) this would require about ~1200 kg to LEO. PSLV-CA can place a 2100kg payload into a eastly 620 km LEO.

[TheVarun]

this would require about ~1200 kg to LEO. PSLV-CA can place a 2100kg payload into a eastly 620 km LEO.

   PSLV-CA may be able to take a 1200kg payload to LEO, but a 2100kg- I think the PSLV-XL( with 6*12 tonne strap ons) would be needed.  BTW, why is there an uneven match between 'vehicles and missions'?  ISRO is saying things like '6 vehicles and 7 missions"  Doesn't one rocket count as one mission, even if it is carrying multiple satellites?  Or are they referring to Arianespace's launching of Indian satellites, when referring to the extra mission?

[K210]

I think the PSLV-XL( with 6*12 tonne strap ons) would be needed.

The PSLV-XL can place 3800 kg into 620 km eastly LEO. It would be overkill for a mission that only requires around ~1200 kg of performance hence why i stated CA variant in my post. For reference the LEO payload capacities of the various PSLV configs are: 2100 Kg (CA), 3250 kg (G) and 3800 kg (XL).

Or are they referring to Arianespace's launching of Indian satellites, when referring to the extra mission?

This is probably the case. GSAT-30 has been waiting for a ride on Ariane-V for some time now.

[zubenelgenubi]

Are the RISAT-2BRs designed to "stack" under the payload fairing?  One would have to be constructed to bear the weight of the other through the rigors of launch.

Or, does ISRO have a SYLDA-like device for dual co-payloads?

If the answer to both of my questions is no, then I deduce that both RISAT-2BRs cannot be launched on the same PSLV, in the immediate future (now to the end of the year).

[tehwkd]

FLP confirmed,

11dec 0930-1130 UTC
12dec 0900-1100 UTC
13dec 0830-1030 UTC

A2802/19 - PSLV-C48 ROCKET LAUNCH FM SHAR RANGE, SRIHARIKOTA WILL TAKE PLACE AS PER FLW DETAILS.THE LAUNCH WILL BE ON ANY ONE OF THE DAY DRG THIS PERIOD. ACTUAL DATE OF LAUNCH WILL BE INTIMATED 24 HR IN ADVANCE THRU A SEPARATE NOTAM. LAUNCH PAD COORD: 1343.9N08014.2E. NO FLT IS PERMITTED OVER THE DNG ZONES. A.) DNG ZONE 1: A CIRCLE OF 10NM AROUND THE LAUNCHER. B.) DNG ZONE 2: A SECT BTN 25NM AND 90NM FM LAUNCH PAD COORD AND BTN AZM ANGLES 130DEG AND 150DEG FM TRUE NORTH. C.) DNG ZONE 3: AREA ENCLOSED BY THE FLW COORD: I) 1035N08215E II) 1105N08245E III) 1020N08320E IV) 0950N08250E D.) DNG ZONE 4: AREA ENCLOSED BY FLW COORD: I) 0830N08340E II) 0900N08410E III) 0755N08455E IV) 0725N08425E E.) DNG ZONE 5: AREA ENCLOSED BY FLW COORD: I) 0605S09150E II) 0505S09305E III) 0705S09405E IV) 0805S09250E F.) DNG ZONE 6: AREA ENCLOSED BY FLW COORD: I) 4700S15500W II) 4200S15500W III) 3400S14000W IV) 3015S13110W V) 3515S13110W ALL COORD ARE IN DEG AND MIN. RTE AFFECTED IN CHENNAI FIR- W20,Q24,V4,Q23,V9,A465,P761,P574,B466,N564,L896,N563,T3,V3,V6,V8, Q10 AND Q11 END PART 1 OF 3. 11 0930-1130, 12 0900-1100 AND 13 0830-1030, 11 DEC 09:30 2019 UNTIL 13 DEC 10:30 2019. CREATED: 29 NOV 10:42 2019

F3522/19 - ROCKET LAUNCH WILL TAKE PLACE FLW RECEIVED FROM GOVERNMENT OF INDIA: PSLV C48 ROCKET LAUNCH FROM INDIA IS NOW SCHEDULED SPLASHDOWN DANGER ZONE BOUNDED BY 0605S 09150E 0505S 09305E 0705S 09405E 0805S 09250E. SFC - UNL, 1912110930 TO 1912111130 1912120900 TO 1912121100 1912130830 TO 1912131030, 11 DEC 09:30 2019 UNTIL 13 DEC 10:30 2019. CREATED: 29 NOV 20:27 2019

[chota]

^
No dog leg manoeuvre?

[zubenelgenubi]

No dog leg manoeuvre?

Apparently, no.  RISAT-2B launched into a 37 degree inclination orbit.

However, by visual inspection, the NOTAMs appear to map an ascent to a somewhat greater orbital inclination?  This also occurred for RISAT-2B.

Also noting that the 2-hour NOTAM window shifts forward 30 minutes/day.

Will RISAT-2B, 2BR1, and 2BR2, once all are operational, be a 3 satellite constellation, orbits of 37 deg inclination, but with the ascending nodes of each orbit separated by 120 deg?
***

Also, noting that this launch could occur a minimum of 14 days after C47!

[K210]

Are the RISAT-2BRs designed to "stack" under the payload fairing?  One would have to be constructed to bear the weight of the other through the rigors of launch.

Or, does ISRO have a SYLDA-like device for dual co-payloads?

If the answer to both of my questions is no, then I deduce that both RISAT-2BRs cannot be launched on the same PSLV, in the immediate future (now to the end of the year).

ISRO has been able to launch multiple primary payloads on PSLV for a couple of years now. For example in the C28 mission they launched three 450 kg satellites together as the primary payload. I suspect the reason why they are only launching a single RISAT-2BR sat probably has to do with payload readiness and pressure from certain "entities".

[zubenelgenubi]

Cross-post from the C46 launch thread:

Drawing of RISAT 2B from the press kit. Looks like a large deployable antenna on top of the vehicle. Mass is 615 kg to 557 km 37° orbit. Radar frequency is X-Band. Applications include agriculture, forestry and disaster management support.

[input~2]

https://economictimes.indiatimes.com/news/science/isro-to-launch-surveillance-satellite-on-dec-11/articleshow/72351007.cms


Launch planned for December 11

[whiztech]

The configuration is PSLV-QL and scheduled for 09:55 UTC

https://www.isro.gov.in/launcher/pslv-c48-risat-2br1

[zubenelgenubi]

Interesting re: adding four PSOMs

Does adding first stage performance leave more delta-v for the PS4 after the deployment of RISAT-2BR1?

For instance, will the operational orbit for QPS-SAR 1 differ from that of RISAT-2BR1?  Delta-v could be for orbit raising or lowering to deploy a secondary payload before the 4th stage end of mission.

[ZachS09]

Interesting re: adding four PSOMs

Does adding first stage performance leave more delta-v for the PS4 after the deployment of RISAT-2BR1?

For instance, will the operational orbit for QPS-SAR 1 differ from that of RISAT-2BR1?  Delta-v could be for orbit raising or lowering to deploy a secondary payload before the 4th stage end of mission.

Yes, it does. The more PSOMs you attach, the more delta-v the fourth stage gets after initial orbit insertion. What bothers me is the fact that the total payload mass is within the CA's capability (between 600 and 700 kg), yet a slightly-more powerful PSLV is being used for this mission.

[zubenelgenubi]

Further from https://www.isro.gov.in/launcher/pslv-c48-risat-2br1

PSLV-C48 will also carry 9 customer satellites of Israel(1), Italy(1), Japan(1) and USA(6) as co-passengers. These international customer satellites are being launched under a commercial arrangement with NewSpace India Limited (NSIL).

We know the identities of five secondary payloads:
QPS-SAR 1 is the Japanese payload, massing circa 100 kg with a 3.6 m unfurling antenna.

Four of the six USA satellites are Lemur-2 cubesats.

What are the remaining two USA satellites, and the one each from Israel and Italy?
***

ADD re: NOTAM counting and comparing to the previous PSLV-QL launch:
There are five dropzones, one more than needed for a core-alone launch.  (unless the Pacific drop zone was for the fourth stage--apparently not so)

[whiztech]

Launch kit

[zubenelgenubi]

What are the remaining two USA satellites, and the one each from Israel and Italy?

Launch kit

Israel, Space Laboratory of the Herzliya Science Centre (HSC): Duchifat-3, 3U cubesat

USA, Hera Systems: 1HOPSat TD, 12U cubesat, 22 kg

USA: Tyvak-0129, multiU cubesat (technology demonstration)

Italy: Tyvak-0092, ?U cubesat (search and rescue)